body{
    margin: 0px;
    padding: 0px;
}
#wrapper{
    width: 1000px;
    margin: auto;
}
#wrapper > div{
    border: 1px solid yellowgreen;
}
#wrapper > div:nth-child(odd){
    background: #003300;
}
#wrapper > div:nth-child(even){
    background: #000000;
}
.small{
    height: 100px;
}
.medium{
    height: 150px;
}
.large {
    height: 200px;
}
.small section{
    width: 200px;
}
.medium section{
    width:250px;
}
.large section{
    width: 300px;
}
.small section,.medium section,.large section{
    height: 100%;
    margin: 0px 40px;
}
.small section:first-child, .medium section:first-child{
    margin-left: 20px;
}
.small section:last-child, .medium section:last-child,{
    margin-right: 20px;
}
.medium section{
    width:250px;
    height: 100%;
}
.large section{
    width: 300px;
    height: 100%;
}
section{
    float: left;
}
div.small, div.medium, div.large, section{
    position: relative;
}
.left{
    float:left;
}
.right{
    float:right;
}
.btnsmall{
    display: block;
    width: 100px;
    height: 28px;
    margin: auto;
    margin-top:28px;
    background: darkred;
    border: solid 1px #000000;
    -webkit-border-radius:10px;
    text-align: center;
    line-height: 28px;
}